Neymar was among five players sent off in stoppage time as Marseille beat bitter rival Paris Saint-Germain for the first time in nine years.
PSG star Neymar got a straight red in Marseille’s 1-0 win following an altercation with center half Alvaro Gonzalez on Sunday.
Neymar was sent off following a video replay showing he aimed a jab to the back of Gonzalez’s head.
As he went off, Neymar told officials that he had been racially abused.
“It’s a serious wrongdoing if that’s the case but I don’t think so,” Marseille coach Andre Villas-Boas said.
“What we saw, what was visible, is that (Angel) Di Maria spat (on Gonzalez).”
With apparent reference to Gonzalez, Neymar later tweeted “The only regret I have is not hitting the face of this idiot.”
In a later tweet, Neymar said “It’s easy for VAR to show my ‘aggression’. ‘Now I’d like to them to show the image of the racist who called me a ‘MONKEY SON OF A BITCH’. I’d really like that!”
Winger Florian Thauvin scored in the 31st minute of a tense game featuring more than a dozen yellow cards and which descended into chaos deep into stoppage time as punches and kicks were exchanged.
It was Marseille’s first victory over PSG since a 3-0 home win in November 2011.
PSG has now lost three straight games 1-0, including the Champions League final against Bayern Munich on Aug 23 and away to promoted Lens last Thursday.
PSG lost its opening two league games for the first time since the 1984-85 season and Tuchel may find himself under early pressure.
The game ended with PSG defender Layvin Kurzawa and Marseille counterpart Jordan Amavi sent off for fighting in the seventh minute of injury time at Parc des Princes.
PSG’s Leandro Paredes and Marseille’s Dario Benedetto soon followed before Neymar’s expulsion.